Multiple socket for incandescent lamps.



F. J. RUSSELL.

MULTIPLE SOCKET FOB mcmnnscnm LAMPS.

APPLICATION BLED APR. 13, 1908.

' 947,763, Patented m. 25,1910.

mmesses I mvsmove ay mmv J ATTORNEYS ANDREW B. GRAHAM on maunmmmm, WASHINGTON, a c.

UNITED STATES PATENT OFFICE.

FRANK J. RUSSELL, OF NEW YORK, N. Y.

MULTIPLE SOCKET FOR INCANDESCENT LAMPS.

known as multiple sockets or clusters, and

in which means are provided for receiving and holding anumber of lamps in a cluster of two or more.

The object of my invention is to provide an improved multiple socket, especially one in which provision is made for carrying a variable number of lamp holders. By preference the body of the socket is to be made of porcelain or other such insulating material, constituting what is termed commercially an all-porcelain socket, although my improvements may be applied to cluster fixtures with metallic covers.

In the accompanying drawings Figure 1 is a vertical section through a multiple socket constructed in accordance with my invention; Fig. 2 is an inner face view of the base; Fig. 3 is an inner face view of the cap with its supported receptacles; Fig. 4 is a sectional perspective view of a part of the cap; and Fig. 5 is a View of a part of a modified form of cap.

The body of the multiple socket is in two parts consisting of a base A and a cap C, each by preference of porcelain. The base A has a downwardly extending annular flange a to meet the cap C, and to form with it the usual rounded outline characteristic of these cluster sockets.

The cap C is detachably secured to the base bya central headed screw D, whose wthreaded shank passes freely through an opening in a plate E secured to the cap, as

by screws 6, c. The threaded end of the screw enters a threaded hole in a bracket F, which is secured to the base A by a screw 7, and carries a binding screw f for one of the supply wires. The head of the central securing screw D can play in an opening d l in the cap, but this opening has a contracted part al ig. l) of a size suflicient for the admission of the end of a screw driver, but

too small'to let the head of the screw D pass through, so that the screw D cannot Specification of Letters Patent. Patented J 3,11. 25, 1910. Application filed April 13, 1908. Serial No. 426,771.

drop out and get lost, when unscrewed from the bracket F.

In the drawings the lamp holders H are shown as carried by the cap C and they are unounted outside the body of the cluster. The plate E is at the same time a mechanical securing means and an electrical conductor. A device G, which may be in the form of a clamp, as shown, extends through an opening in the cap to mechanically connect each lamp holder H with the plate E. In this way, it will be seen that the lamp holders are carried by the cap and detachable with it from the base A. Each lamp holder may be of any suitable construction. In the drawing I have shown a lamp holder of the receptacle type with central and screw shell terminals for Edison lamp bases. I have shown the screw shell h of each lamp holder as electrically connected to the clamp G which serves as an electrical as well as a mechanical connection. The central terminal 71, of each lamp holder is electrically connected with an upwardly extending spring contact finger J, which when the cap is fitted to the base, makes electricalconnection with a flanged ring K secured to the base within its flange a. A terminal plate 72 electrically connected to the ring K has a binding screw is, by which the second supply wire is connected up.

The openings in the cap for the passage of the connecting pieces G are in the form of notches M (Fig. 5) in the rim of the cap, and in order that each cap maybe adapted to carry a varying number of lamp holders within its capacity, I may form in the rim notches M as many in number and arrange.

ment as may be needed to hold either two, three, four or six lamp holders, for instance. Or what is better, I may form in each cap, at its rim recesses m, (Fig. 4) leaving thin knockout sections M which can be knocked out of the rim of the cap to produce as many notches M as the occasion demands.

I claim as my invention:

1. A multiple lamp cluster, having a two part body, one part carrying lamp holders and the other a contactring, and each lamp holder having a contact finger to make connection with the contact ring when the parts are united, and means separate from the said contacts to detachably secure the two parts of the body together.

2. A multiple lamp cluster, having a twocap carrying lamp holders while the base.

has a contact ring, and each lamp holder having a contact finger to make connection with the contact ring, when the parts are united, and means separate from the said contacts to detachably secure the two parts of the body together.

3. A multiple lamp cluster, having a twopart body, consisting of a cap and base, both of insulating material, external lamp-holders, a metallic piece carried by the cap, means for mechanically securing the lamp holders to said piece, a ring on the base and means for electrically connecting one of the terminals to said ring on applying the cap to the base.

part inclosing body with knock-out sections 7 in the edge of one of said parts to receive connections for lamp holders.

6. A multiple lamp cluster, having a two part inclosing body, comprising a base and cap, the latter having knock-out sections in its mm.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

FRANK J. RUSSELL.

Witnesses:

WILLIAM ABBE, HUBERT HOWSON. 

